1. Find an equation for the tangent plane to the surface S(s, t) = (sin s cost, sin s sin t, cos s) at the point (s, t) = (π/4, π/2). Sketch the surface and its tangent plane

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.